sysinfo: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/sysinfo - from package: sysinfo

You may install the required package with command apt-get install {package}

Error in other languages:
sysinfo: bevel nie gevind nie
sysinfo: comandă negăsită
sysinfo: comando não encontrado
sysinfo: commande introuvable
sysinfo: command not found
sysinfo: käsku ei ole
sysinfo: không tìm thấy lệnh
sysinfo: komanda nerasta
sysinfo: Kommando nicht gefunden.
sysinfo: kommandot finns inte
sysinfo: komut yok
sysinfo: nie znaleziono polecenia
sysinfo: níor aimsíodh an t-ordú
sysinfo: no se encontró la orden
sysinfo: no s'ha trobat l'ordre
sysinfo: opdracht niet gevonden
sysinfo: parancs nem található
sysinfo: perintah tidak ditemukan
sysinfo: príkaz nenájdený
sysinfo: příkaz nenalezen
sysinfo: команда не найдена
sysinfo: командата не е открита
sysinfo: 命令找不到
sysinfo: コマンドが見つかりません